Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76a1692df68dbfab6f5cd3bfe06241cb7071a9c8ac6deadf305be93951b4da8' 
  AND token = 'xcHaHdOr9VBStGuGyPIRa7qnNMW+ArGdZv45GyLwNnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}